--- /dev/null
+target remote :1234
+layout split
+stepi
+quit
+target remote :1234
+layout split
+stepi
+b *main+9
+quit
--- /dev/null
+set history save on
+set history size 1000
+set history remove-duplicates 2
+set history filename .gdb_history
+
--- /dev/null
+.depend
+**/build
+**/dist
+**/sim
--- /dev/null
+{
+ "configurations": [
+ {
+ "name": "Linux AVR",
+ "includePath": [
+ "/usr/lib/avr/include/**",
+ "/usr/lib/gcc/avr/**"
+ ],
+ "defines": [],
+ "compilerPath": "/usr/bin/avr-gcc",
+ "compilerArgs": [
+ "-mmcu=atmega644p",
+ "-Os",
+ "-DF_CPU=12000000",
+ "-DBAUD_RATE=115200",
+ "-DDOUBLE_SPEED",
+ "-DNUM_LED_FLASHES=4",
+ "-DMAX_TIME_COUNT=F_CPU>>4"
+ ],
+ "cStandard": "gnu11",
+ "cppStandard": "gnu++11",
+ "intelliSenseMode": "linux-gcc-x64"
+ }
+ ],
+ "version": 4
+}
--- /dev/null
+{
+ // Use IntelliSense to learn about possible attributes.
+ // Hover to view descriptions of existing attributes.
+ // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+ "version": "0.2.0",
+ "configurations": [
+ {
+ "name": "Build",
+ // "request": "launch",
+ "type": "node-terminal",
+ "preLaunchTask": "build"
+ },{
+ "name": "Flash",
+ // "request": "launch",
+ "type": "node-terminal",
+ "preLaunchTask": "flash"
+ },{
+ "name": "Clean",
+ // "request": "launch",
+ "type": "node-terminal",
+ "preLaunchTask": "clean"
+ },{
+ // es muss mit simuc --board arduino dist/programm.elf der Simulator
+ // gestartet werden. Dessen gdb-stub öffnet auf localhost:1234 einen Port
+ "name": "Debug (simuc)",
+ "type": "cppdbg",
+ "request": "launch",
+ "program": "${workspaceFolder}/sim/atmega328p.elf",
+ "cwd": "${workspaceFolder}",
+ "externalConsole": false,
+ "MIMode": "gdb",
+ "miDebuggerPath": "/usr/bin/avr-gdb",
+ "miDebuggerServerAddress": ":1234",
+ "preLaunchTask": "build"
+ }
+ ]
+}
--- /dev/null
+{
+ "[c]": {
+ "editor.insertSpaces": true,
+ "editor.tabSize": 3,
+ "editor.detectIndentation": false
+ },
+ "[h]": {
+ "editor.insertSpaces": true,
+ "editor.tabSize": 3,
+ "editor.detectIndentation": false
+ },
+ "cSpell.words": [],
+ "cSpell.ignorePaths": [
+ "**/*.json", "**/*.c", "**/*.h", "**/Makefile"
+ ],
+ "files.associations": {
+ "delay.h": "c",
+ "boot.h": "c",
+ "stdio.h": "c"
+ }
+}
--- /dev/null
+{
+ // See https://go.microsoft.com/fwlink/?LinkId=733558
+ // for the documentation about the tasks.json format
+ "version": "2.0.0",
+ "tasks": [{
+ "label": "build",
+ "type": "shell",
+ "command": "make",
+ "problemMatcher":[
+ "$gcc"
+ ]
+ },{
+ "label": "clean",
+ "type": "shell",
+ "command": "make",
+ "args": [ "clean" ],
+ },{
+ "label": "flash",
+ "type": "shell",
+ "command": "make",
+ "args": [ "flash" ],
+ }]
+}
\ No newline at end of file
--- /dev/null
+#.PHONY: all info flash picocom clean
+#$(shell mkdir -p dist >/dev/null)
+#$(shell mkdir -p build >/dev/null)
+#$(shell mkdir -p sim >/dev/null)
+
+#NAME="bootloader-arduino_nano-644"
+#DEVICE="atmega644p"
+#SRC= $(wildcard src/*.c)
+#OBJ = $(SRC:src/%.c=build/%.o)
+#OBJ_SIM = $(SRC:src/%.c=sim/%.o)
+
+#CC= avr-gcc
+#CFLAGS_DEFINES= -DF_CPU=12000000 -DBAUD_RATE=115200 -DDOUBLE_SPEED -DNUM_LED_FLASHES=4 '-DMAX_TIME_COUNT=F_CPU>>4'
+#LFLAGS_DEFINES= -DF_CPU=12000000
+#CFLAGS= -Wall -mmcu=$(DEVICE) -Os $(CFLAGS_DEFINES) -c
+#LFLAGS= -Wall -mmcu=$(DEVICE) -Os $(LFLAGS_DEFINES) -Wl,--section-start=.text=0xe000
+
+#CFLAGS_SIM= -Wall -mmcu=$(DEVICE) -O1 $(CFLAGS_DEFINES) -g -c
+#LFLAGS_SIM= -Wall -mmcu=$(DEVICE) -O1 $(LFLAGS_DEFINES) -g -Wl,--section-start=.text=0xe000
+
+.PHONY: all info flash picocom clean
+$(shell mkdir -p dist >/dev/null)
+$(shell mkdir -p build >/dev/null)
+$(shell mkdir -p sim >/dev/null)
+$(shell mkdir -p sim/build >/dev/null)
+
+NAME="bootloader-arduino_nano-644"
+SRC= $(wildcard src/*.c src/*.cpp src/*/*.c src/*/*.cpp)
+HDR= $(wildcard src/*.h src/*.hpp src/*/*.h src/*/*.hpp)
+OBJ_CPP = $(SRC:src/%.cpp=build/%.o)
+OBJ = $(OBJ_CPP:src/%.c=build/%.o)
+OBJ_SIM_CPP = $(SRC:src/%.cpp=sim/build/%.o)
+OBJ_SIM = $(OBJ_SIM_CPP:src/%.c=sim/build/%.o)
+
+DEVICE=atmega644p
+
+CC= avr-g++
+CFLAGS= -Wall -mmcu=$(DEVICE) -Os -DF_CPU=12000000 -DBAUD_RATE=115200 -DDOUBLE_SPEED -DNUM_LED_FLASHES=4 '-DMAX_TIME_COUNT=F_CPU>>4' -c
+#LFLAGS= -Wall -mmcu=$(DEVICE) -Os -DF_CPU=12000000 -Wl,-u,vfprintf -lprintf_flt -lm
+LFLAGS= -Wall -mmcu=$(DEVICE) -Os -DF_CPU=12000000 -Wl,--section-start=.text=0xe000
+
+CFLAGS_SIM= -Wall -mmcu=$(DEVICE) -Og -DF_CPU=12000000 -g -DBAUD_RATE=115200 -DDOUBLE_SPEED -DNUM_LED_FLASHES=4 '-DMAX_TIME_COUNT=F_CPU>>4' -c
+#LFLAGS_SIM= -Wall -mmcu=$(DEVICE) -Og -DF_CPU=12000000 -g -Wl,-u,vfprintf -lprintf_flt -lm
+LFLAGS_SIM= -Wall -mmcu=$(DEVICE) -Og -DF_CPU=12000000 -g -Wl,--section-start=.text=0xe000
+
+
+all: dist/$(NAME).elf dist/$(NAME).s dist/$(NAME).hex sim/$(NAME).elf sim/$(NAME).s info
+
+dbg:
+ @echo --HDR---------------------------------
+ @echo $(HDR)
+ @echo --SRC---------------------------------
+ @echo $(SRC)
+ @echo --OBJ---------------------------------
+ @echo $(OBJ)
+ @echo --OBJ_CPP-----------------------------
+ @echo $(OBJ_CPP)
+ @echo --OBJ---------------------------------
+ @echo $(OBJ)
+ @echo ===================================
+ @echo
+
+info:
+ @avr-size --mcu=$(DEVICE) --format=avr dist/$(NAME).elf
+
+.depend: $(SRC) $(HDR)
+ $(CC) -mmcu=$(DEVICE) -MM $(SRC) | sed --regexp-extended 's/^(.*\.o)\: src\/(.*)(\.cpp|\.c) (.*)/build\/\2\.o\: src\/\2\3 \4/g' > .depend
+
+-include .depend
+
+# .depend solte auch auf Header Files achten!
+
+dist/$(NAME).elf: .depend $(OBJ)
+ $(CC) $(LFLAGS) -o $@ $(OBJ)
+
+dist/%.s: dist/%.elf
+ avr-objdump -d $< > $@
+
+dist/%.hex: dist/%.elf
+ avr-objcopy -O ihex $(HEX_FLASH_FLAGS) $< $@
+
+sim/$(NAME).elf: .depend $(OBJ_SIM)
+ $(CC) $(LFLAGS_SIM) -o $@ $(OBJ_SIM)
+
+
+build/%.o: src/%.c
+ @mkdir -p $(dir $@)
+ $(CC) $(CFLAGS) -o $@ $<
+
+build/%.o: src/%.cpp
+ @mkdir -p $(dir $@)
+ $(CC) $(CFLAGS) -o $@ $<
+
+sim/build/%.o: src/%.c
+ @mkdir -p $(dir $@)
+ $(CC) $(CFLAGS_SIM) -o $@ $<
+
+sim/build/%.o: src/%.cpp
+ @mkdir -p $(dir $@)
+ $(CC) $(CFLAGS_SIM) -o $@ $<
+
+sim/%.s: sim/%.elf
+ avr-objdump -d $< > $@
+
+simuc: sim/$(NAME).elf
+ simuc --board arduino $<
+
+gdb: sim/$(NAME).elf
+ avr-gdb $<
+
+isp-644p:
+ avrdude -c usbasp -p m644p
+
+isp-flash-644p: dist/$(NAME).elf all
+ avrdude -c usbasp -p m644p -e -U flash:w:$<
+
+isp-flash-644p-latest-release:
+ avrdude -c usbasp -p m644p -e -U flash:w:release/$(shell ls -A release | tail -n 1)/$(NAME).elf
+
+isp-read-flash-644p:
+ avrdude -c usbasp -p m644p -U flash:r:/tmp/flash-nano-644__$(shell date +"%Y-%m-%d_%H%M%S")
+
+flash-644p: dist/$(NAME).elf all
+ avrdude -c arduino -p m644p -P /dev/ttyUSB0 -b 115200 -e -U flash:w:$<
+
+
+picocom:
+ # picocom sends CR for ENTER -> convert cr (\r) to lf (\n)
+ picocom -b 115200 --omap crlf /dev/ttyUSB0
+
+isp-erase-644p:
+ avrdude -c usbasp -p m644p -e
+
+isp-fuse-644p:
+ #avrdude -c usbasp -p m644p -U lfuse:w:0xFF:m -U hfuse:w:0xD8:m -U efuse:w:0xFF:m -U lock:w:0xFF:m
+ #avrdude -c usbasp -p m644p -U lfuse:w:0xFF:m -U hfuse:w:0xD8:m -U efuse:w:0xFE:m -U lock:w:0xEF:m
+ # LFUSE=0xEE -> startuptime 1K CLOCKS + 0ms -> 83us
+ #avrdude -c usbasp -p m644p -U lfuse:w:0xEE:m -U hfuse:w:0xD8:m -U efuse:w:0xFE:m -U lock:w:0xEF:m
+ # LFUSE=0xE7 -> startuptime 16K CLOCKS + 4.1ms -> 5.4ms
+ avrdude -c usbasp -p m644p -U lfuse:w:0xEF:m -U hfuse:w:0xD8:m -U efuse:w:0xFE:m -U lock:w:0xEF:m
+
+clean:
+ @rm -r dist
+ @rm -r build
+ @rm -r sim
+ @find . -type f -name ".depend" -exec rm {} \;
+ @echo "clean done"
--- /dev/null
+# Arduino-Bootloader (STK500) für Nano-644 (ATmega644P)
+
+Dieser Bootloader ermöglicht die Programmierung über das "Arduino-System". Als Kommunikationsprotokoll kommt das [STK500 Protokoll]( https://www.microchip.com/content/dam/mchp/documents/OTH/ApplicationNotes/ApplicationNotes/doc2525.pdf) zur Anwendung (Kommunikationsablauf siehe Datei [protocol](protocol)).
+
+Beim Bootloader in [src/main.c](src/main.c) handelt es sich um eine Anpassung von [https://github.com/arduino/ArduinoCore-avr/blob/master/bootloaders/atmega/ATmegaBOOT_168.c](https://github.com/arduino/ArduinoCore-avr/blob/master/bootloaders/atmega/ATmegaBOOT_168.c) an die Hardware des Nano-644 Boards.
+
+Diese Anpassung der Quelltext-Datei umfasst:
+* Microcontroller Atmega644P (mit 64KiB Flash, davon die hinteren 8KiB für den Bootloader)
+* Frequenz 12MHz
+* 3 LEDs (rot, gelb, grün)
+* Assembler-Anweisungen durch Macros aus `avr/boot.h` ersetzt
+* Quelltextkorrekturen, damit der Bootloader auch bei einer Page-Size von 256 Byte funktioniert
+
+Der Bootloader kann entweder selbst aus der Quelltextdatei erzeugt werden (siehe [Übersetzung](#%C3%BCbersetzung)), oder es wird eine der bereits fertigen Dateien im Ordner [release](release) verwendet:
+* [release/2024-09-05_120027/bootloader-arduino_nano-644.elf](release/2024-09-05_120027/bootloader-arduino_nano-644.elf)
+* [release/2024-09-05_120027/bootloader-arduino_nano-644.hex](release/2024-09-05_120027/bootloader-arduino_nano-644.hex)
+
+## Übersetzung
+
+Folgende Tools sind erforderlich:
+* avr-gcc
+* avrdude
+
+Auf einem Linux-Debian System müssen daher folgende Pakete installiert sein:
+```sh
+sudo apt update
+sudo apt install gcc-avr avr-libc binutils-avr avrdude
+```
+
+Die Übersetzung erfolgt dann mit dem Kommando `make`.
+
+## Download auf den µC
+
+Die korrekte Programmierung der Fuses sowie der Download des Bootloaders in den Bootloader-Bereich des µC-Flash kann mit Hilfe eines [USBasp-Programmiergeräts](https://www.fischl.de/usbasp/) mit folgenden Kommandos erfolgen:
+
+```sh
+make isp-fuse-644p
+make isp-flash-644p
+```
+
+... oder die aktuellste Version im Unterordner [release](release) ...
+```sh
+make isp-fuse-644p
+make isp-flash-644p-latest-release
+```
+
+Nach der Programmierung sollten die drei LEDs den Start des Bootloader anzeigen (rot -> rot+orange -> grün -> grün blinken).
+
+
+## Download von Programmen mit Hilfe des Bootloaders
+
+Sobald sich am µC ein Bootloader befindet ist kein Programmiergerät mehr erforderlich. Das Programm wird über die serielle UART-Schnittstelle (via USB-Schnittstelle) in den Flash gespeichert.
+
+UART-Schnittstelle (Option `-P`) und Name der ELF-Programmdatei (nach `flash:w:`) sind anzupassen...
+
+```sh
+avrdude -c arduino -p m644p -P /dev/ttyUSB0 -b 115200 -e -U flash:w:programm.elf
+```
+
+## Einbindung in die Arduino IDE
+
+Zunächst den Ordner mit der Arduino Installation finden. Unter Linux ist das der Pfad:
+```
+/usr/share/arduino/hardware/arduino/avr
+```
+
+Dort im Unterordner `bootloaders` einen Ordner `atmeg644` anlegen und darin die Intel-Hex Datei des Bootloaders ablegen.
+
+```sh
+make
+sudo mkdir /usr/share/arduino/hardware/arduino/avr/bootloaders/atmega644
+cp dist/bootloader-arduino_nano-644.hex /usr/share/arduino/hardware/arduino/avr/bootloaders/atmega644/
+```
+
+Danach in der Datei `/usr/share/arduino/hardware/arduino/avr/boards.txt` folgende Einträge ergänzen:
+```
+#########################################################
+
+nano644.name=Nano-644
+
+nano644.vid.0=0x1a86
+nano644.pid.0=0x7522
+nano644.upload_port.0.vid=0x1a86
+nano644.upload_port.0.pid=0x7522
+
+nano644.upload.tool=avrdude
+nano644.upload.tool.default=avrdude
+nano644.upload.tool.network=arduino_ota
+nano644.upload.protocol=arduino
+nano644.upload.maximum_size=57344
+nano644.upload.maximum_data_size=4096
+nano644.upload.speed=115200
+
+nano644.bootloader.tool=avrdude
+nano644.bootloader.tool.default=avrdude
+nano644.bootloader.low_fuses=0xFF
+nano644.bootloader.high_fuses=0xD8
+nano644.bootloader.extended_fuses=0xFF
+nano644.bootloader.unlock_bits=0xFE
+nano644.bootloader.lock_bits=0xEF
+nano644.bootloader.file=atmega644/bootloader-arduino_nano-644.hex
+
+nano644.build.mcu=atmega644p
+nano644.build.f_cpu=12000000L
+nano644.build.board=AVR_NANO644
+nano644.build.core=arduino
+nano644.build.variant=standard
+
+##############################################################
+```
+
+Nach dem Start der Arduino-IDE kann:
+* über das Menü *Werkzeuge->Board* das ***Nano-644*** gewählt werden
+* über das Menü *Werkzeuge->Programmer* der ***ArduinoISP*** gewählt werden
+
--- /dev/null
+ 0.552750 --> 2: 3020
+ 0.555474 <-- 2: 1410
+ 0.803623 --> 2: 3020
+ 0.806825 <-- 2: 1410
+ 1.054395 --> 2: 3020
+ 1.057282 <-- 2: 1410
+
+ 1.057514 --> 3: 4181 20
+ 1.060837 <-- 3: 1401 10
+ 1.061061 --> 3: 4182 20
+ 1.063819 <-- 3: 1410 10
+ 1.064049 --> 22: 4282 0000 0101 0101 03ff ffff ff01 0008 0000 0100 0020
+ 1.068274 <-- 2: 1410
+ 1.068436 --> 7: 4505 08d7 a000 20
+ 1.071346 <-- 2: 1410
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+ 1.087176 <-- 5: 141e 960a 10
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+
+ 1.191326 --> 4: 5500 0020
+ 1.193964 <-- 2: 1410
+
+ 1.194133 --> 32: 6401 0046 0c94 3e00 0c94 5b00 0c94 5b00 0c94 5b00 0c94 5b00 0c94 5b00 0c94 5b00
+ 1.194154 --> 32: 0c94 5b00 0c94 5b00 0c94 5b00 0c94 5b00 0c94 5b00 0c94 5b00 0c94 ad00 0c94 5b00
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+ 1.194310 --> 32: 0c94 5b00 0c94 5b00 0c94 5b00 0c94 5b00 0c94 5b00 0c94 9c00 0c94 5b00 0c94 5b00
+ 1.197469 --> 32: 1124 1fbe cfef d0e1 debf cdbf 11e0 a0e0 b1e0 e8e2 f8e0 02c0 0590 0d92 aa34 b107
+ 1.199991 --> 32: d9f7 21e0 aae4 b1e0 01c0 1d92 a235 b207 e1f7 0e94 d100 0c94 1204 0c94 0000 0f93
+ 1.202760 --> 32: 1f93 cf93 c82f 8b01 8a30 19f4 8de0 0e94 5d00 8091 c000 85ff fccf 8091 4e01 9091
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+
+ 1.255743 --> 4: 5580 0020
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+
+ 1.258821 --> 32: 6401 0046 0f92 1124 8f93 9f93 ef93 ff93 98b1 88e0 8927 88b9 8091 c600 8093 ce00
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+
+ 1.320378 --> 4: 5500 0120
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+
+ 1.323205 --> 32: 6401 0046 9093 5101 8093 5001 1092 0001 7894 80e0 90e0 c0e0 d1e0 0ee2 11e0 359b
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+
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+
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--- /dev/null
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+:040000030000E00019\r
+:00000001FF\r
--- /dev/null
+/*************************************************************************************************/
+/* Serial Bootloader for Atmel megaAVR Controllers */
+/* */
+/* Source-code taken from: */
+/* https://github.com/arduino/ArduinoCore-avr/blob/master/bootloaders/atmega/ATmegaBOOT_168.c */
+/* Branch@hash: master@321fca0b */
+/* */
+/* Licence can be viewed at http://www.fsf.org/licenses/gpl.txt */
+/* */
+/*************************************************************************************************/
+
+#include <inttypes.h>
+
+#include <avr/boot.h>
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+#include <avr/interrupt.h>
+#include <avr/wdt.h>
+// #include <util/delay.h>
+
+// #define DEBUG_UART1
+#ifdef DEBUG_UART1
+ #include <stdio.h>
+#endif
+
+// after this many errors give up and launch application
+#define MAX_ERROR_COUNT 5
+
+#define HW_VER 0xF1
+#define SW_MAJOR 0x01
+#define SW_MINOR 0x10
+
+// onboard LED is used to indicate, that the bootloader was entered
+#define SET_LED_RED (PORTC |= (1 << PC2))
+#define CLR_LED_RED (PORTC &= ~(1 << PC2))
+#define SET_LED_ORANGE (PORTC |= (1 << PC3))
+#define CLR_LED_ORANGE (PORTC &= ~(1 << PC3))
+#define SET_LED_GREEN (PORTC |= (1 << PC4))
+#define CLR_LED_GREEN (PORTC &= ~(1 << PC4))
+
+// function prototypes
+void putch(char);
+char getch(void);
+void getNch(uint8_t);
+void byte_response(uint8_t);
+void nothing_response(void);
+char gethex(void);
+void puthex(char);
+void flash_led(uint8_t);
+
+volatile const char DATE [] PROGMEM = __DATE__;
+volatile const char TIME [] PROGMEM = __TIME__;
+
+#ifdef DEBUG_UART1
+ int uart_putchar(char c, FILE *stream) {
+ if (c == '\n') {
+ uart_putchar('\r', stream);
+ }
+ loop_until_bit_is_set(UCSR1A, UDRE1);
+ UDR1 = c;
+ return 0;
+ }
+
+ static FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE);
+#endif
+
+// some variables
+union address_union {
+ uint16_t word;
+ uint8_t byte[2];
+} address;
+
+union length_union {
+ uint16_t word;
+ uint8_t byte[2];
+} length;
+
+struct flags_struct {
+ unsigned eeprom : 1;
+ unsigned rampz : 1;
+} flags;
+
+uint8_t buff[SPM_PAGESIZE + 1];
+// uint8_t address_high;
+// uint8_t pagesz=0x80;
+
+uint16_t i;
+uint8_t bootuart = 0;
+
+uint8_t error_count = 0;
+
+void (*app_start)(void) = 0x0000;
+
+int main () {
+ uint8_t ch, ch2;
+ uint16_t w;
+
+ #ifdef WATCHDOG_MODS
+ ch = MCUSR;
+ MCUSR = 0;
+
+ WDTCSR |= _BV(WDCE) | _BV(WDE);
+ WDTCSR = 0;
+
+ // Check if the WDT was used to reset, in which case we dont bootload and skip straight to the code. woot.
+ if (! (ch & _BV(EXTRF))) // if its a not an external reset...
+ app_start(); // skip bootloader
+ #else
+ asm volatile("nop\n\t");
+ #endif
+
+ // LED ports output and off, ensure that Q1 (battery power) on (PC7)
+ PORTC = 0;
+ DDRC = (1 << PC7) | (1 << PC4) | (1 << PC3) |(1 << PC2);
+
+
+ #ifdef DOUBLE_SPEED
+ UCSR0A = (1 << U2X0); // Double speed mode USART0
+ UBRR0L = (uint8_t)(F_CPU / (BAUD_RATE *8L) - 1);
+ UBRR0H = (F_CPU / (BAUD_RATE * 8L) - 1) >> 8;
+ #ifdef DEBUG_UART1
+ UCSR1A = (1 << U2X1); // Double speed mode USART0
+ UBRR1L = (uint8_t)(F_CPU / (BAUD_RATE *8L) - 1);
+ UBRR1H = (F_CPU / (BAUD_RATE * 8L) - 1) >> 8;
+ #endif
+ #else
+ UBRR0L = (uint8_t)(F_CPU / (BAUD_RATE * 16L) - 1);
+ UBRR0H = (F_CPU / (BAUD_RATE*16L)-1) >> 8;
+ #ifdef DEBUG_UART1
+ UBRR1L = (uint8_t)(F_CPU / (BAUD_RATE * 16L) - 1);
+ UBRR1H = (F_CPU / (BAUD_RATE*16L)-1) >> 8;
+ #endif
+ #endif
+
+ UCSR0B = (1<<RXEN0) | (1<<TXEN0);
+ UCSR0C = (1<<UCSZ00) | (1<<UCSZ01);
+ UCSR1B = (1<<TXEN1);
+ UCSR1C = (1<<UCSZ00) | (1<<UCSZ01);
+
+ #ifdef DEBUG_UART1
+ stdout = &mystdout;
+ printf("\n\nArduino-Bootloader\n");
+ #endif
+
+ // flash onboard LED to signal entering of bootloader */
+ flash_led(NUM_LED_FLASHES);
+
+ // forever loop
+ while (1) {
+
+ // get character from UART
+ ch = getch();
+
+ // A bunch of if...else if... gives smaller code than switch...case !
+
+ // Hello is anyone home ?
+ if(ch == '0') {
+ nothing_response();
+
+ } else if (ch == '1') {
+ // Request programmer ID
+ // Not using PROGMEM string due to boot block in m128 being beyond 64kB boundary
+ // Would need to selectively manipulate RAMPZ, and it's only 9 characters anyway so who cares.
+
+ if (getch() == ' ') {
+ putch(0x14);
+ putch('A');
+ putch('V');
+ putch('R');
+ putch(' ');
+ putch('I');
+ putch('S');
+ putch('P');
+ putch(0x10);
+ } else {
+ if (++error_count == MAX_ERROR_COUNT) {
+ DDRC = 0; PORTC = 0;
+ app_start();
+ }
+ }
+
+ } else if (ch == '@') {
+ // AVR ISP/STK500 board commands DON'T CARE so default nothing_response
+ ch2 = getch();
+ if (ch2 > 0x85) getch();
+ nothing_response();
+
+ // *****************************
+ // AVR ISP/STK500 board requests
+ // *****************************
+
+ } else if (ch == 'A') { // 0x41
+ ch2 = getch();
+ if (ch2 == 0x80) {
+ byte_response(HW_VER); // Hardware version
+ } else if (ch2 == 0x81) {
+ byte_response(SW_MAJOR); // Software major version
+ } else if(ch2 == 0x82) {
+ byte_response(SW_MINOR); // Software minor version
+ } else if(ch2==0x98) {
+ byte_response(0x03); // Unknown but seems to be required by avr studio 3.56
+ } else {
+ byte_response(0x00); // Covers various unnecessary responses we don't care about
+ }
+
+ } else if (ch == 'B') { // B: 0x42
+ // Device Parameters DON'T CARE, DEVICE IS FIXED
+ getNch(20);
+ nothing_response();
+
+
+ } else if (ch == 'E') { // E: 0x45
+ // Parallel programming stuff DON'T CARE
+ getNch(5);
+ nothing_response();
+
+ } else if (ch == 'P' || ch == 'R') { // P: 0x50, R: 0x52
+ // P: Enter programming mode
+ // R: Erase device, don't care as we will erase one page at a time anyway.
+ nothing_response();
+
+ } else if (ch == 'Q') { // Q: 0x51
+ // Leave programming mode
+ nothing_response();
+ #ifdef WATCHDOG_MODS
+ // autoreset via watchdog (sneaky!)
+ WDTCSR = _BV(WDE);
+ while (1); // 16 ms
+ #endif
+
+ } else if(ch == 'U') { // U: 0x55
+ // Set address, little endian. EEPROM in bytes, FLASH in words
+ // Perhaps extra address bytes may be added in future to support > 128kB FLASH.
+ // This might explain why little endian was used here, big endian used everywhere else.
+ address.byte[0] = getch();
+ address.byte[1] = getch();
+ nothing_response();
+
+
+ } else if (ch == 'V') { // V: 0x56
+ // Universal SPI programming command, disabled. Would be used for fuses and lock bits.
+ if (getch() == 0x30) {
+ getch();
+ ch = getch();
+ getch();
+ if (ch == 0) {
+ byte_response(SIGNATURE_0);
+ } else if (ch == 1) {
+ byte_response(SIGNATURE_1);
+ } else {
+ byte_response(SIGNATURE_2);
+ }
+ } else {
+ getNch(3);
+ byte_response(0x00);
+ }
+
+ } else if (ch == 'd') { // d: 0x64
+ // Write memory, length is big endian and is in bytes
+ length.byte[1] = getch();
+ length.byte[0] = getch();
+ flags.eeprom = 0;
+ if (getch() == 'E') {
+ flags.eeprom = 1;
+ }
+ for (w = 0; w < length.word; w++) {
+ // Store data in buffer, can't keep up with serial data stream whilst programming pages
+ buff[w] = getch();
+ }
+ if (getch() == ' ') {
+ if (flags.eeprom) {
+ // Write to EEPROM one byte at a time
+ address.word <<= 1;
+ for(w = 0; w < length.word; w++) {
+ while(EECR & (1<<EEPE));
+ EEAR = (uint16_t)address.word;
+ EEDR = buff[w];
+ EECR |= (1<<EEMPE);
+ EECR |= (1<<EEPE);
+ // SX
+ // eeprom_write_byte((void *)address.word,buff[w]);
+ address.word++;
+ }
+ } else {
+ // Write to FLASH one page at a time
+ #ifdef RAMPZ
+ if (address.byte[1] > 127) {
+ //Only possible with m128, m256 will need 3rd address byte. FIXME
+ RAMPZ = 0x01;
+ } else {
+ RAMPZ = 0x00;
+ }
+ #endif
+
+ // address * 2 -> byte location
+ address.word = address.word << 1;
+ if ((length.byte[0] & 0x01)) {
+ // Even up an odd number of bytes
+ length.word++;
+ }
+ cli();
+
+ uint16_t addr = address.word;
+ #ifdef DEBUG_UART1
+ printf("Programming: address=0x%04x length=0x%04x\n", addr, length.word);
+ printf(" eeprom_busy_wait() ...");
+ #endif
+ eeprom_busy_wait();
+ boot_spm_busy_wait();
+ #ifdef DEBUG_UART1
+ printf("done\n");
+ printf(" boot_page_erase(0x%04x)...", address.word);
+ #endif
+ SET_LED_RED;
+ boot_page_erase(addr);
+ boot_spm_busy_wait ();
+ CLR_LED_RED;
+ #ifdef DEBUG_UART1
+ printf("done\n");
+ printf(" boot_page_fill(0x%04x, ...): ", address.word);
+ #endif
+ for (i = 0; i < SPM_PAGESIZE; i += 2) {
+ uint16_t w = buff[i] + (buff[i + 1] << 8);
+ #ifdef DEBUG_UART1
+ printf(".");
+ #endif
+ boot_page_fill(addr + i, w);
+ }
+ #ifdef DEBUG_UART1
+ printf("\n boot_page_write(0x%04x)...", address.word);
+ #endif
+ boot_page_write(addr);
+ boot_spm_busy_wait();
+ #ifdef DEBUG_UART1
+ printf("done\n");
+ printf(" boot_rww_enable()\n");
+ #endif
+ boot_rww_enable();
+ }
+ putch(0x14);
+ putch(0x10);
+
+ } else {
+ if (++error_count == MAX_ERROR_COUNT)
+ DDRC = 0; PORTC = 0;
+ app_start();
+ }
+
+ } else if (ch == 't') { // t: 0x74
+ // Read memory block mode, length is big endian. */
+ length.byte[1] = getch();
+ length.byte[0] = getch();
+ // if (address.word>0x7FFF) flags.rampz = 1; // No go with m256, FIXME
+ // else flags.rampz = 0;
+ address.word = address.word << 1; // address * 2 -> byte location
+ if (getch() == 'E') {
+ flags.eeprom = 1;
+ } else {
+ flags.eeprom = 0;
+ }
+ if (getch() == ' ') {
+ // Command terminator
+ putch(0x14);
+ for (w = 0; w < length.word; w++) {
+ // Can handle odd and even lengths okay
+ if (flags.eeprom) { // Byte access EEPROM read
+ while(EECR & (1<<EEPE));
+ EEAR = (uint32_t)address.word;
+ EECR |= (1<<EERE);
+ putch(EEDR);
+ // putch(eeprom_read_byte((void *)address.word));
+ address.word++;
+ }
+ else {
+ #ifdef RAMPZ
+ if (!flags.rampz) {
+ putch(pgm_read_byte_near(address.word));
+ } else {
+ putch(pgm_read_byte_far(address.word + 0x10000));
+ }
+ #else
+ putch(pgm_read_byte_near(address.word));
+ #endif
+ address.word++;
+ }
+ }
+ }
+ putch(0x10);
+
+ } else if(ch == 'u') { // u: 0x75
+ // Get device signature bytes
+ if (getch() == ' ') {
+ putch(0x14);
+ putch(SIGNATURE_0);
+ putch(SIGNATURE_1);
+ putch(SIGNATURE_2);
+ putch(0x10);
+ } else {
+ if (++error_count == MAX_ERROR_COUNT)
+ DDRC = 0; PORTC = 0;
+ app_start();
+ }
+
+ } else if (ch == 'v') {
+ // Read oscillator calibration byte
+ byte_response(0x00);
+ }
+
+ }
+}
+
+char gethexnib () {
+ char a;
+ a = getch(); putch(a);
+ if (a >= 'a') {
+ return (a - 'a' + 0x0a);
+ } else if (a >= '0') {
+ return (a - '0');
+ }
+ return a;
+}
+
+
+char gethex () {
+ return (gethexnib() << 4) + gethexnib();
+}
+
+
+void puthex (char ch) {
+ char ah;
+
+ ah = ch >> 4;
+ if(ah >= 0x0a) {
+ ah = ah - 0x0a + 'a';
+ } else {
+ ah += '0';
+ }
+
+ ch &= 0x0f;
+ if(ch >= 0x0a) {
+ ch = ch - 0x0a + 'a';
+ } else {
+ ch += '0';
+ }
+
+ putch(ah);
+ putch(ch);
+}
+
+
+void putch (char ch) {
+ while (!(UCSR0A & _BV(UDRE0)));
+ UDR0 = ch;
+}
+
+
+char getch () {
+ uint32_t count = 0;
+ while( !(UCSR0A & _BV(RXC0)) ) {
+ count++;
+ if (count > MAX_TIME_COUNT) {
+ DDRC = 0; PORTC = 0;
+ app_start();
+ }
+ }
+ return UDR0;
+}
+
+
+void getNch (uint8_t count) {
+ while(count--) {
+ getch();
+ }
+}
+
+
+void byte_response (uint8_t val) {
+ if (getch() == ' ') {
+ putch(0x14);
+ putch(val);
+ putch(0x10);
+ } else if (++error_count == MAX_ERROR_COUNT) {
+ DDRC = 0; PORTC = 0;
+ app_start();
+ }
+}
+
+void nothing_response () {
+ if (getch() == ' ') {
+ putch(0x14);
+ putch(0x10);
+ } else if (++error_count == MAX_ERROR_COUNT) {
+ DDRC = 0; PORTC = 0;
+ app_start();
+ }
+}
+
+void delay () {
+ // app. 200ms
+ for (volatile uint32_t timer = 0; timer < 0x12000; timer++) {
+ if (UCSR0A & _BV(RXC0)) {
+ return;
+ }
+ }
+}
+
+void flash_led (uint8_t count) {
+ SET_LED_RED;
+ delay();
+ SET_LED_ORANGE;
+ delay();
+ PORTC = 0;
+
+ while (count--) {
+ SET_LED_GREEN;
+ delay();
+ CLR_LED_GREEN;
+ delay();
+ }
+}
projects / nano-x.git / commitdiff